Power transmitting mechanism



Aug. 27, 1935. E. J. DE NORMANVILLE POWER TRANSMITTING MECHANISM FiledOct. 25, 1954 2 Sheets-Sheet 1 C I J g 777 ALL Figi Aug. 27, 1935' E. J.DE NORMANVILLE 2,012,377

POWER TRANSMITTING MECHANI SM Filed Oct. 25, 1934 Z'Sheets-Sheet 2 0 5 pp k d Fig;2.

Q Worms "1 Patented Aug. 27, 1935 2,012,377

UNITED STATES PATENT OFFICE A 2,012,377 POWER TRANSMITTING MECHANISMEdgar Joseph de Normanville, Kingsbury, England, assignor of one-half tode Normanville Transmissions Limited, Coventry, England ApplicationOctober 23, 1934, Serial No. 749,599 In Great Britain November 4, 1933 5Claims. (Cl. 741-290) This invention has for its object to provide anshown between an extension of the planet carimproved power transmittingmechanism of the rier and the driven shaft. epicyclic type adapted foruse more particularly The arrangement of the mechanism above deon motorvehicles, but applicable to a variety of scribed is such that when themember h carrying 5 analogous uses such as, for example, on machine thesun pinion g is free and motion is being 8 tools, transmitted from thedriving to the driven shaft, The invention comprises the combination ofa the epicyclic mechanism rotates as one piece, driving member, a drivenmember, a fixed memrelative motion being prevented by the clutch 1 her,an epicyclic mechanism for transmitting mobetween the planet carrier andthe driven shaft.

10 tion from the said driving member to the said To drive the drivenshaft at a higher speed than 10 driven member, a unidirectional clutchfor conthe driving shaft the member )1. is held by the necting arotatable part of the said mechanism brake, and the clutch I has then noeffect. to the said driven member, means for arresting Should motion betransmitted from the driven another rotatable part of the said mechanismfor Shaft to the driving shaft, while the -sun pinion varying the speedof the drive transmitted from brake is operative, the engine will serveto re- 15 the driving member to the driven member, and sist, the motionas in ordinary motor vehicle another unidirectional clutch forconnecting the mechanisms, but Should the u P n ake b second mentionedpart f the said mechanism to released, the desired efiective connectionwith the the said fixed member and for enabling motion engine would nolonger exist were it not for a 0 to be transmitted from the said drivenmember to d free W e t h 1L a ra between the the said driving memberwhen the said arresting member h and the stationary casing m. This meansare in an inoperative position. clutch is such that it looks the sunpinion mem- In the two accompanying sheets of explanaher to the casingwhen the shaft b drives the entory drawings:- gine, and so causes thedesired connection with Figures l'and 2 are sectional elevationsrespecthe engine to be maintained. 25 tively illustrating two differentmechanisms con- When it is desirable to limit the torque which structedin accordance with this invention. can be mposed on the clutch n, I empy he In the construction in accordance with this arrangement shown in Fiure This arr n invention as shown in Figure 1 of a power transment issimilar to the one shown in Figure 1, but

mitting mechanism which is adapted to supplen add a pp Clutch o quelimiting 30 ment the ordinary variable speed transmission device isplaced between the clutch n and the mechanism of a motor vehicle andwhich is arcasing. In the example illustrated the outer ranged betweenthe said ordinary mechanism and ring of t clutch Combined in p ed theusual engine driven clutch, or between the connection with it an annularring 0 the opposite engine and the clutch, I employ a pair of coaxialfaces of which co-operate with friction rings p 35 shafts herein termedthe driving shaft a and the one of which is fixed to the casing, whilstthe driven shaft b. The driving shaft is connected other is ca i d n aSeparate D q attached to the clutch or the engine and the driven shaftto the casing by bolts 1' On ch Springs 8 are to the ordinary variablespeed mechanism or the mounted for setting up the required interfacialclutch. On the driving shaft a is formed or sepressure between the parts0, p, and q. This 40 cured a planet pinion carrier c on which planetpressure is sufiicient to hold the outer ring of the pinions d aremounted, and on the driven shaft clutch under normal conditions, but inthe event is formed or secured a member e carrying an of an excessivetorque being exerted on the internally toothed annulus f gearing withthe clutch, the ring 0 slips between the parts 12 and planet pinions.The sun pinion g is conveniently so prevents injury to the mechanism.

arranged at thecentre of a member h in the By means of mechanisms asabove described form of a case which encloses one end of the I am ableto supplement the ordinary variable mechanism and is rotatably carriedbyabearing 5, speed mechanism of a motor vehicle in a very a brake orother device (not shown) being arsimple and satisfactory manner.

ranged to act on the peripheral part k of the The invention is notlimited to the examples 50 member h for holding or releasing it. abovedescribed as subordinate details of con- Also I provide in combinationwith the planet struction maybe varied to suit different require pinioncarrier and the driven shaft, a unidirecments. The form of gearing abovedescribed is tional clutch 1 (free wheel clutch) of any coni that whichis preferred but it also may be modivenient form, this being mounted inthe example fied if desired. Further the mechanisms may for somepurposes be conveniently arranged between the ordinary transmissionmechanism and the propeller shaft. Moreover, the invention, as alreadystated, is applicable to other uses in which variable speed transmissionof power is required. Thus it may be applied to the operation of machinetools, or other machinery, or the propulsion of ships, or aircraft, orfor connecting any prime mover to an apparatus tobe driven between thesaid mechanism and both the driven shaft and a fixed casing, I may forsome purposes provide a clutch between the epicyclic mechanism and thefixed casing only.

Having thus. described myinvention what I claim as new and desire tosecure by Letters Patent is:

1. In power transmitting mechanisms, the combination of an epicyclicmechanism, a unidirectional clutch for connecting a part of themechanism to the driven shaft, another unidirectional clutch forconnecting another part of the mechanism to a fixed member, and a torquelimiting device associated with the second mentioned clutch.

2. A power transmitting-mechanism comprising the combination of atwo-speed epicyclic mechanism which contains sun and planet pinions, aplanet pinion carrier, a driven annulus, and means for arresting the sunpinion, with a driving member, a driven member, a fixed member, aunidirectional clutch between the said planet pinion carrier and thesaid driven member, another unidirectional clutch between the said sunpinion and the said fixed member, and

a torque limiting device between the second mentioned clutch and thesaid fixed member.

3. In power transmitting mechanisms, the combination of a drivingmember, a driven member, a fixed member, an epicyclic mechanism fortransmitting motion from the said driving member to the said drivenmember, a unidirectional clutch for connecting a rotatable part of thesaid mechanism to the said driven member, means for arresting anotherrotatable part of the said mechanism for varying the speed of the drivetransmitted from the driving member to the driven member, and anotherunidirectional clutch for connecting the second mentioned part of thesaid mechanism to the said fixed member and thereby enabling motion tobe transmitted from the said driven member to the said driving memberwhen thesaid arresting means are in an inoperative position.

4. In a mechanism as claimed in claim 3, the combination with the secondmentioned clutch, of a torque limiting device.

5. A power transmitting mechanism comprising the combination of atwo-speed epicyclic mechanism which contains sun and planet pinions, aplanet pinion carrier, a driven annulus, and means for arresting the sunpinion, with a driving member, a driven member, a fixed member, aunidirectional clutch between the said planet pinion carrier and thesaid driven member, and. another unidirectional clutch between the saidsun pinion and the said fixed member.

EDGAR JOSEPH DE NORMANVIILIE.

